Adrian wrote on Jun 27^th, 2015 at 10:18am:


My CPA begins to misfire and I find the hammer spring tension screw to have backed out.  A half-turn with the 1/16" Allen wrench picks it up again.  Is this a common occurance?  Took some hair pulling to figure that one out.

I've been shooting traditional PB in CBA matches here in Vancouver with 9.3 of AA9, and Remington 6 1/2 or 7 1/2 primers.  Swapping in Federal 205's was disastrous....This fall and winter I'll start pushing the envelope to get velocities up in the 1450 range.
  Yeah, that is a light load but when the wind is read correctly it has gotten some good scores.  I'll push the envelope if 4100 ever appears.  But yes, in my experience primers do matter.

JLouis wrote on Jun 28^th, 2015 at 5:54pm:


Never had the opportunity to live near a suitable range during my mobile working life.  After retirement returned to shooting and found cast bullet matches, where I competed in scoped military.  Took the national 10-round 300 group record until my buddy took it back last month.   Its a friendly group without the **ck bumping seen in formal CF matches.
  To compete in PB I picked up a 32-20 CPA after some discussion with Gail.  It's also used by others in the region so there is some direct competion.  It's a challenging rifle, but without the headaches of case massaging necessary for 30 BR for example.  So I'm on the rapid learning curve at 67...but if its not fun there is no sense in pursuing it..too much like my career!

Quote:

Jerry - notice the flame comparison between the Federal 205's and the CCIBr4's.  The smaller the flame shooting smokeless powders creates less brisance with the sonic gas pressure wave shattering the grains of powder on denotation ... which I believe to be a better 'controlled' denotation resulting in better accuracy using various powders 
Federal 205
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CCI BR4
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Another low brisance primer is the PMCSRM
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And here is the brisance of a Remington 7.5SR primer 
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JLouis wrote on Jun 28^th, 2015 at 10:53pm:


Bill Anderson, Bud Lawry, Lee Alexander, John Schauf, Doug Sellenberger, Virgil Edwards.  I'm firing a 1917 Win. 30/06. Bud has fired possibles at 100 and 200 with his Springfield 03A3.  CPA shooters are from up north, Mitch Migliaccio and Bud Hiatt.  Maybe next year I'll get down to Springfield.  Both Springfield and Puyallup are 2.5 hrs each way.

OkeyMaple,

Very interesting that you've had no misfires with the MAR primers. The gentleman I talked to at Federal assured me that I would have problems.

He also assured me the primers were identical in composition, the only difference being a harder cup material. 

I'm sure he was doing his best to relay what he thought was accurate information and trying hard to be helpful. I'm not sure what to think now.

Seeing as how they're working for you without any problems I'm tempted to think he was at least partly right with what he told me. Possibly he was erring on the side of caution about the misfires.

I've not seen any pictures of the MAR brisance to be able to compare them to the 205GMM. I'll take a look or maybe someone else will be able to find some pictures.

This just proves that you never know what will work in your rifle until you do some testing.

Thanks for this addition to this thread.

JerryH

JerryH, etc. - I just returned from the range. Fired 50+ rounds .25-20WCF using 9.2 & 9.4 of 4100 and Fed. 205-MAR primers. No problems were encountered. Wind, weather was calm to very light breeze, sunny, 65 - 75 degrees. Ideal. Accuracy was as good as, if not better than previously achieved by this neophyte shooter.